CN101865838A - Visible light-near infrared optical fiber spectrograph - Google Patents
Visible light-near infrared optical fiber spectrograph Download PDFInfo
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- CN101865838A CN101865838A CN 201010204848 CN201010204848A CN101865838A CN 101865838 A CN101865838 A CN 101865838A CN 201010204848 CN201010204848 CN 201010204848 CN 201010204848 A CN201010204848 A CN 201010204848A CN 101865838 A CN101865838 A CN 101865838A
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Abstract
The invention relates to a visible light-near infrared optical fiber spectrograph, belonging to the technical field of analytical instruments. The luminous optical path of an spectrograph optical source is provided with a sample reflecting device; the reflecting optical path of the sample reflecting device is provided with a light splitter; the middle of the light splitting path of the light splitter is provided with a first electrooptical signal conversion device responding to a corresponding wave spectrum, the two sides of the light splitting path of the light splitter are respectively provided with a left split light reflecting device and a right split light reflecting device; the split light reflecting optical paths of the left split light reflecting device and the right split light reflecting device are respectively provided with a second electrooptical signal conversion device and a third electrooptical signal conversion device which respond to corresponding wave spectrums; the signal output ends of the electrooptical signal conversion devices are respectively connected with the corresponding ports of a computer; and the computer is used for splicing electrooptical signals with different wavelengths respectively output by the electrooptical signal conversion devices into spectrum signals with continuous wavelengths split by the light splitter. The invention realizes the image surface splicing of a plurality of CCDs of a single optical path, thereby having compact structure and solving the difficulty of receiving the spectrum signals of a full-wave band for once.
Description
Technical field
The present invention relates to the spectrometer that a kind of mineralogical analysis is used, especially a kind of visible light-light-near infrared optical fiber spectrograph belongs to technical field of analytical instruments.
Background technology
The fiber spectrometer kind is a lot, yet at the fiber spectrometer of mineralogical analysis but seldom.Understand according to the applicant, existing spectrometer defectiveness on GEOLOGICAL APPLICATION, because at the informative 2000nm-2500nm wave band of mineral, existing spectrometer (for example ASD spectrometer of the U.S.) signal to noise ratio (S/N ratio) is lower.CCD linear array device spectrometer that its structure essence is 200～1100nm and the combination of the scan-type spectrometer of 1100～2500nm are formed by stacking, so system bulk is big, and speed is slower, therefore need to improve.
Summary of the invention
The objective of the invention is to:, propose a kind ofly to survey wide waveband (spectral range can cover 400～2500nm) and the visible light-light-near infrared optical fiber spectrograph of compact conformation at the shortcoming that above-mentioned prior art exists.
In order to reach above purpose, visible light-light-near infrared optical fiber spectrograph of the present invention contains light source; The luminous light path of described light source is provided with the sample reflection unit, and the reflected light path of described sample reflection unit is provided with light-dividing device; The beam split light path middle part of described light-dividing device is provided with the first photosignal conversion equipment (CCD) of response respective wavelength spectrum, and both sides are respectively equipped with left and right minute light reflecting device the first photosignal conversion equipment not being accepted the spectrum total reflection; Be respectively equipped with the second and the 3rd photosignal conversion equipment of response respective wavelength spectrum on the beam split reflected light path of described left and right minute light reflecting device; The signal output part of described each photosignal conversion equipment connects the echo port of computing machine respectively, and described computing machine is the continuous wavelength spectral signal that light-dividing device is told in order to the different wave length spectral signal amalgamation that each photosignal conversion equipment is exported respectively.
Understand according to the applicant, do not cover the single CCD device of the full spectral coverage of wavelength 400～2500nm in the prior art, the spectrum that therefore will cover so wide zone must adopt polylith response different wavelength regions the CCD device, if these CCD devices are constituted the spectrometer of different-waveband respectively with reference to prior art, the structure that is bound to is too fat to move, the cost costliness; And if with it and come same sensitive surface, because frame and the assemblage gap of each CCD, adjacent certainly exists at interval, promptly adjacent light-sensitive surface can't be realized seamless connection, therefore certainly will exist to leak the spectrum phenomenon, can't obtain continuous full spectrum of wavelengths.The present invention adopts the CCD of space distribution, and by the spectral band of ingenious each CCD of distribution of minute light reflecting device, and then the amalgamation by each band spectrum, realized the image planes splicing of a plurality of CCD of single cover light path, thereby, solved the disposable reception difficult problem of all band spectral signal with compact structure.During concrete enforcement, the first photosignal conversion equipment should adopt the ccd detector of response 950nm～1650nm wave spectrum, and the second and the 3rd photosignal conversion equipment on the left and right beam split reflected light path then adopts the ccd sensor of response 400nm～1050nm wave spectrum respectively and responds the ccd detector of the wave spectrum of 1650nm-2500nm.After spectral signal that these three CCD will change separately was transferred to computing machine, promptly capable assembling was for covering the full spectral coverage signal of wavelength 400～2500nm.
The present invention further improves, and is provided with the catoptrical conduction optical fiber of conduction between described sample reflection unit and the light-dividing device.Can reasonably arrange flexibly like this and sample reflection unit and light-dividing device more help saving the space.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is the light path synoptic diagram among Fig. 1 embodiment.
Fig. 3 is the distribution schematic diagram of CCD among Fig. 1 embodiment.
Embodiment
Embodiment one
The spectral band scope of ore to be analyzed is 400～2500nm.Because prior art does not cover the single CCD device of the full spectral coverage of wavelength 400～2500nm, therefore to cover the wavelength in so long zone, must adopt polylith response different wavelength regions the CCD device.The scheme one that realizes full spectral coverage instantaneous measurement in this zone is to adopt many cover light paths and a plurality of CCD; The 2nd, adopt a plurality of CCD image planes splicings of single cover light path.The former systems bulky need be carried out redistributing of luminous energy to light entrance.Latter's compact conformation, but need to solve the difficult body of image planes splicing.
Present embodiment through repeatedly research, the scheme of affirmation as depicted in figs. 1 and 2, the luminous light path of this visible light-light-near infrared optical fiber spectrograph light source is provided with the sample reflection unit, the reflected light path of this sample reflection unit is provided with light-dividing device.Be provided with the catoptrical conduction optical fiber 1 of conduction between sample reflection unit and the light-dividing device.Light-dividing device contain will the output of conduction optical fiber 1 reflected light project collimating mirror 3 slit 2, be positioned at grating 4 on described collimating mirror 3 collimated light paths, be positioned at grating 4 and divide condensers 5 on the light paths continuously, the beam split light path middle part of described condenser 5 is provided with the first photosignal conversion equipment---the ccd detector CCD10 of response 950nm～1650nm wave spectrum, and both sides are respectively equipped with the left and right dichroic reflector 6 and 7 of the first photosignal conversion equipment not being accepted the spectrum total reflection.---the 3rd photosignal conversion equipment of Si material C CD sensor CCD9 and response 1650nm-2500nm wave spectrum---the InGaAs material C CD detector C CD11 that is respectively equipped with the second photosignal conversion equipment of response 400nm～1050nm wave spectrum on the beam split reflected light path of left and right dichroic reflector.
Three distributions of ccd sensor on light-dividing device are referring to Fig. 3, CCD9, CCD10 and CCD11 form 3 D spliced, wherein the CCD10 as the first photosignal conversion equipment is installed in the light-dividing device side, CCD9, CCD11 as the second and the 3rd photosignal conversion equipment then are installed in the light-dividing device end face, thereby realize that continuous spectrum is seamless spliced.The signal output part of three CCD connects the control and the echo port of anacom respectively, and this computing machine is the continuous wavelength spectral signal of the 400-2500nm that tells of light-dividing device in order to the different wave length spectral signal amalgamation that each photosignal conversion equipment is exported respectively.
During work, the light beam irradiates that light source sends is behind ore sample to be analyzed, the mixed light of reflection sees through slit 2 by optical fiber 1, becoming directional light after collimating 3 beats on grating 4, after grating 4 beam split, be divided into the continuous light of 400-2500nm by focus lamp, wherein the 400-950nm wave band is received by CCD9 after through catoptron 6 deflection vertically upward, the 950-1650nm wave band is directly received by CCD10, and the 1650-2500nm wave band is received by CCD11 the back vertically upward through catoptron 7 deflections.After the signal output of three CCD is transferred to computing machine, pieces together continuous visible light-near infrared all band spectrum, thereby can comprehensively analyze ore to be analyzed.
Present embodiment adopts the benefit of reflective imaging beam splitting system maximum to be, has that suitable spectral range is wide, a no color differnece, advantage such as spectrum face grazing is good and volume is little.Reflection efficiency height particularly, luminous flux attenuation is little, has improved signal to noise ratio (S/N ratio).Present embodiment utilizes a grating to finish the broad band beam split of 400-2500nm, and this grating blaze wavelength in 400nm～2500nm wave band is arranged on 1900nm; Grating is at 400～1050m efficient low (5%～10%), and the detector of selecting for use is very high in the response of this spectrum segment, thereby has remedied energy fault herein.
Adopt optical fiber to import, produce diffraction after the light beam outgoing as light signal, be with the quasi-optical object lens of central maximum value directive of diffraction, and be full of its whole bore, can determine the profit maximal value of incident optical core diameter thus: a=2 * 1.22 λ * f/D; F is quasi-optical objective focal length in the formula, and D is the aperture diameter of quasi-optical object lens.
Present embodiment is at the present situation that does not cover the full spectral line array detector of 400-2500nm, adopt three linear array detectors to carry out the stereo staggered splicing in image planes, thereby rationally realized full spectral coverage detection, and adopted the one-channel signal treatment circuit to realize the data acquisition of three-route array detector.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (6)
1. a visible light-light-near infrared optical fiber spectrograph contains light source; The luminous light path of described light source is provided with the sample reflection unit, and the reflected light path of described sample reflection unit is provided with light-dividing device; It is characterized in that: the beam split light path middle part of described light-dividing device is provided with the first photosignal conversion equipment of response respective wavelength spectrum, and both sides are respectively equipped with left and right minute light reflecting device the first photosignal conversion equipment not being accepted the spectrum total reflection; Be respectively equipped with the second and the 3rd photosignal conversion equipment of response respective wavelength spectrum on the beam split reflected light path of described left and right minute light reflecting device; The signal output part of described each photosignal conversion equipment connects the corresponding port of computing machine respectively, and described computing machine is the continuous wavelength spectral signal that light-dividing device is told in order to the different wave length spectral signal amalgamation that each photosignal conversion equipment is exported respectively.
2. visible light-light-near infrared optical fiber spectrograph according to claim 1 is characterized in that: be provided with the catoptrical conduction optical fiber of conduction between described sample reflection unit and the light-dividing device.
3. visible light-light-near infrared optical fiber spectrograph according to claim 2 is characterized in that: described light-dividing device contain with the reflected light of described conduction optical fiber output project collimating mirror slit, be positioned at grating on the described collimating mirror collimated light path, be positioned at described grating and divide condenser on the light path continuously; The beam split light path middle part of described condenser is provided with the described first photosignal conversion equipment, and both sides are respectively equipped with the left and right dichroic reflector of the first photosignal conversion equipment not being accepted the spectrum total reflection; Be respectively equipped with described second photosignal conversion dress and the 3rd photosignal conversion equipment on the beam split reflected light path of described left and right dichroic reflector.
4. visible light-light-near infrared optical fiber spectrograph according to claim 3, it is characterized in that: the described first photosignal conversion equipment adopts the ccd detector of response 950nm～1650nm wave spectrum, and the second and the 3rd photosignal conversion equipment on the left and right beam split reflected light path then adopts the ccd sensor of response 400nm～1050nm wave spectrum and the ccd detector of the wave spectrum of response 1650nm-2500nm respectively.
5. visible light-light-near infrared optical fiber spectrograph according to claim 4 is characterized in that: grating blaze wavelength in 400nm～2500nm wave band is arranged on 1900nm.
6. visible light-light-near infrared optical fiber spectrograph according to claim 5 is characterized in that: the described first photosignal conversion equipment is installed in the light-dividing device side; The described second and the 3rd photosignal conversion equipment is installed in the light-dividing device end face.
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| CN 201010204848 CN101865838A (en) | 2010-06-22 | 2010-06-22 | Visible light-near infrared optical fiber spectrograph |
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Cited By (8)
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| CN103698313A (en) * | 2013-12-31 | 2014-04-02 | 中国科学院合肥物质科学研究院 | Water vapor Raman laser radar ultraviolet high-resolution grating spectrometer |
| WO2014071700A1 (en) * | 2012-11-06 | 2014-05-15 | 广州标旗电子科技有限公司 | Sampling system and method of reflection spectrum measurement for testing gemstones |
| CN103869476A (en) * | 2014-02-27 | 2014-06-18 | 北京空间机电研究所 | Design method of spaceflight optical remote sensor reflecting splicing spectroscope |
| CN104991243A (en) * | 2015-07-06 | 2015-10-21 | 中国科学院合肥物质科学研究院 | High-resolution ultraviolet multi-wavelength grating spectrometer device |
| CN106226251A (en) * | 2016-07-12 | 2016-12-14 | 南京邮电大学 | Dynamic optical spectroscopy instrument and chemical kinetics determination method |
| CN106706523A (en) * | 2017-01-13 | 2017-05-24 | 清华大学 | Near-infrared spectrometer based on upconversion material |
| CN108931358A (en) * | 2017-05-23 | 2018-12-04 | 弗兰克公司 | Optical array polarity, power and loss are measured using the optical testing device of detector and photodetector is sensed equipped with position |
| CN116576965A (en) * | 2023-06-30 | 2023-08-11 | 徐州光引科技发展有限公司 | Spectrum segmentation calculation reconstruction method, spectrometer and equipment |
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|---|---|---|---|---|
| US9435747B2 (en) | 2012-11-06 | 2016-09-06 | Biaoqi Electronics Technology, Co., Ltd. | Reflectance spectroscopy measuring and sampling system and method for gemstone testing |
| WO2014071700A1 (en) * | 2012-11-06 | 2014-05-15 | 广州标旗电子科技有限公司 | Sampling system and method of reflection spectrum measurement for testing gemstones |
| GB2522342A (en) * | 2012-11-06 | 2015-07-22 | Biaoqi Electronics Technology Co Ltd | Sampling system and method of reflection spectrum measurement for testing gemstones |
| GB2522342B (en) * | 2012-11-06 | 2018-06-06 | Biaoqi Electronics Tech Co Ltd | Reflectance spectroscopy measuring and sampling system and method for gemstone testing |
| CN103698313A (en) * | 2013-12-31 | 2014-04-02 | 中国科学院合肥物质科学研究院 | Water vapor Raman laser radar ultraviolet high-resolution grating spectrometer |
| CN103869476A (en) * | 2014-02-27 | 2014-06-18 | 北京空间机电研究所 | Design method of spaceflight optical remote sensor reflecting splicing spectroscope |
| CN103869476B (en) * | 2014-02-27 | 2015-11-25 | 北京空间机电研究所 | The spectroscopical method for designing of a kind of reflective splicing of space flight optical remote sensor |
| CN104991243A (en) * | 2015-07-06 | 2015-10-21 | 中国科学院合肥物质科学研究院 | High-resolution ultraviolet multi-wavelength grating spectrometer device |
| CN106226251A (en) * | 2016-07-12 | 2016-12-14 | 南京邮电大学 | Dynamic optical spectroscopy instrument and chemical kinetics determination method |
| CN106706523A (en) * | 2017-01-13 | 2017-05-24 | 清华大学 | Near-infrared spectrometer based on upconversion material |
| CN108931358A (en) * | 2017-05-23 | 2018-12-04 | 弗兰克公司 | Optical array polarity, power and loss are measured using the optical testing device of detector and photodetector is sensed equipped with position |
| CN116576965A (en) * | 2023-06-30 | 2023-08-11 | 徐州光引科技发展有限公司 | Spectrum segmentation calculation reconstruction method, spectrometer and equipment |
| CN116576965B (en) * | 2023-06-30 | 2023-09-29 | 徐州光引科技发展有限公司 | Spectrum segmentation calculation reconstruction method, spectrometer and equipment |
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Open date: 20101020 |